Commit f45463d8e2 (tdf#93727 Support date
literals in basic, 2017-05-24) introduced correct parsing of literals
like #2025-09-26#. However, it didn't retain the value type; there was
a discussion about that in gerrit, but no solution was found, and type
was set to double.
Later, a similar problem (storing type of value in compiled image) was
fixed in commit 5eedb3beea (tdf#142460:
properly handle boolean values in string pool, 2021-06-25).
This change reuses the same method to store date type using 'd' char in
the string pool.
Change-Id: I32e8497ece1f30980ba6d4fca248687b817348f2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/191555
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>